The TMAG5124 is a magnetic sensor with a current interface, also called 2-wire interface, that indicates when the magnetic field threshold has been reached. A specific current level is generated depending on its status. All versions have a high-current level of 14.5 mA. Version A to D have a low-current level of 3.5 mA while version E to H have a low-current level of 6 mA.

The field polarity is defined as follows: a south pole near the marked side of the package has a positive magnetic field. A north pole near the marked side of the package has a negative magnetic field.

The unipolar south configuration allows the hall sensor to only respond to a south pole. A strong magnetic field of south polarity will cause the device to go into a low-current level (operate point, BOP), and a weaker magnetic field will cause the device to go into a high-current level (release point, BRP). Hysteresis is included in between the operate and release points, so magnetic field noise will not trip the device level accidentally.

Since the device does not have an output, the magnitude of device supply current will indicate if the magnetic field exceeds the threshold or not. A resistor can be placed before the VCC pin or after the GND pin to transform the current into a voltage that can be read by a microcontroler. More details are provided in Section 9.